John g



J. G. PORTER.

Magazine Hot-Air Furnace. i N0.-101 .9u. Patented,ApriI12,1870.

2 g a W diniwl swa JOHN G. PORTER, OF NEW YORK, N. Y.

Letters Patent No. 101,911, dated April 12, 1870.

BASE-BURNING- HOT-AIR FURNACE.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom it may concern Y 4 Be it known that I, J OHN GJPon'rEn, of the city, county, and State of New York, have invented certain new and useful Improvements in Hot-air Furnaces and I do hereby declare that the following is a full, clear, and exact description of the-same, reference being bad to the accompanying drawings forming part of this specification, in which- Figure l is a central vertical section of a furnace, with my improvement-s.

Figure 2 is'a horizontal section of the same in the plane indicated by the line a: x in fig. 1.

Similar letters of reference indicate corresponding parts in the several figures.

This invention consists, first, in a novel arrangement of the fiues through which'the smoke and gases pass from the fire-chamber of the furnace to the chimney, whereby a very effective heating-surface and a uniform draught all round the fire are obtained.

And it consists, secondly, in a novel arrangement of an air-distributer, for distributing the air to be heated for warming a building or apartment.

To enable others skilled in the art to make and use my invention, I will proceed to describe it with reference to the accompanying drawings.

A is the fire-chamben'of circular or other form, made of cast-iron or of sheet-iron lined with firebrick, or in any other suitable, manner, having a grate, B, and fed through a central magazine, 0, to operate on the base-burning principle or through a door in the one side.

From the upper part of this fire-chamber there branch ofi drop-fines, D D, of cast or sheet-iron or othermaterial, which extend out radially for a short distance, and then descend to an annular flue, E, which surrounds the lower part of the fire-chamber or ash-pit.

From this annular flue E rises, on one side of the fire-chamber, the smoke-pipe F, which may extend light through the top of the air-casing G, or may turn ofi" with an elbow through the side thereof, as shown in the drawings. This smoke-pipe leads to the chimney.

The fines D D are of varying size, according to their. distance from the smoke-pipe; those nearest the smoke-pipe being the smallest, and the others of gradually increased size, according to their distance from the smoke-pipe F.

By this means the draught is uniform all round the fire-chamber, instead of moreintensc near the smokepipe F, as it would be if the fines D D were of uniform size.

The air-casing G, built of brick-work or other material, surrounds the fire-chamber and fines at a suitable distance outside of the drop fines D D and lower annular flue E, and covers the top thereof.

At the bottom of this casing is the annular air-distributer J, surrounding the annular smoke-flue E.

This air-distributor may be cast with the annular smoke-fine or otherwise constructed.

It has an air-duct, H, or may have more than one of such ducts for the ingress of cold air, and in its top there are numerous orifices, I I, for the egress and uniform distribution of the air into the casing G.

In the top of the air-chamber there are one or more openings, K, fig. 1, for the egress of the heated air, and these opcningsmay be filled with ducts to convey the heated air to dilfcrent parts of the building or apartment to be warmed.

When the fire is lighted in the fire-chamber, the smoke and gaseous products of combustion descend the drop-fines D D into the annular bottom fiue E, whence they pass to the smoke-pipe F.

The exterior of the fire-chamber, the exterior of the drop-fines D D and smoke-pipe F, and the exterior of the upper and outer side surfaces of the annular flue E, all constitute heating-surfaces.

The cold air entering the distributer J by the duct His partially heated by the annular smoke-flue E, and thence distributed through the orifices I I into the casing G, and around the fire-chamber, dropfiucs, and smoke-pipe, and heated by contact with the exterior surfaces of the said chamber, flues, and pipe, prior to their exit bythe opening or openings K What I claim as my invention, and desire to secure by Letters Patent, is-

1. The drop-fines D D of graduated size, in combination with the fire-chamberA, annular bottom flue E, and smoke-pipe F, substantially as and for the purpose hereindescribed.

2. The perforated annular air-distributer, arranged around the annular smoke-flue E, in combination with the casing G, fines D D, fire-chamber A, and smokepipe F, substantially as and for the purpose herein set forth.

JOHN G. PORTER.

Witnesses:

FRED. HAYNES, HENRY PALMER. 

